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NTNUJAVA Virtual Physics Laboratory (Java Simulations in Physics) > JDK1.0.2 simulations (1996-2001) > Thermodynamics > Carnot Cycle (Heat Engine)
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Author Topic: Carnot Cycle (Heat Engine)  (Read 123998 times)
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Fu-Kwun Hwang
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« on: January 29, 2004, 08:34:33 PM »
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This java applet show you the physics processes of a Carnot heat engine.
Carnot cycle is a four stage reversible sequence consisting of
1. adiabatic compression
2. isothermal expansion at high temperature T2
3. adiabatic expansion
4. isothermal compression at low temperature T1
5. back to stage 1 and continue.

1. Set the starting point (Press, Volume) of the adiabatic compression process:
    The program will show the piston position and related information
      as you move the mouse inside the P-V region.

    Click the mouse to set the initial P-V value.
    Before you set up the initial P-V value, you can click the horizon line and drag it to change the Max. pressure (Pmax).
    Move the mouse to P=1 atm, and V=22.4(liter), and check out the value of PV/(nR).
    Do you know how many mole of gas is inside the chamber?


2. Set the starting point for the isothermal compression process:
    click the mouse button again (within the possible region).

3. Press Start button to start the animation, Press Reset to reset the conditions.
    Click + to increase speed of animation  , click - to slow it down (Each click change the time scale by 1.25)
    Click RIGHT mouse button to stop the animation, click it again to resume.

    The efficiency of the heat engine will be displayed.
    Different color for the gas volume represent its temperature.
    Color of the piston:
      Red : contact with heat reservoir at high T2.
        Yellow bar within the gas volume is proportional to heat flow (In).

      Green: contact with heat reservoir at low T1.
        Yellow bar within the piston region is proportional to heat flow (Out).
        (Total length of the yellow bar is the maximum heat flow during isothermal
        expansion process, some of the heat were release during the isothermal compression process.)

      Blue : adiabatic process¡C


4. Cp/Cv is the ratio of the specific heat of the gas at constant pressure to that at constant volume.
    You can enter any value larger than 1. (Be reasonable, OK!)
    It will reset the program automatically.


5. While the animation is suspended, move your mouse within the PV-diagram to view the (P, V) values.


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« Reply #1 on: January 30, 2004, 05:03:21 PM »
From: "Franco Di Liberto" <francesco.diliberto@na.infn.it>
To: <hwang@phy03.phy.ntnu.edu.tw>
Subject: Carnot Engine applet
Date: Fri, 7 Jan 2000 15:56:12 +0100

Dear Hwang
I appreciate very much your java applet on Carnot Engine.
I note, anyway, that the P,V values which are shown at the top are =
interchanged (are shown the V,P values) and moreover that the (ingoing =
and outgoing )bar proportional to heat flow is ...Yellow.
I suggest (to be perfect!) that you extend the range of V values to =
include 22,4 liters (the volume occupied by a mole) and (setting =
n=3D1 in PV=3DnRT) show also the Temperatures.
Finally it would be nice that one could stop the animation and read =
(step by step) the P,V values
 and (during the adiabatics) also the T values .=20

Thank you and Happy new Year
Sincerely yours

Francesco di Liberto
I.N.F.M., I.N.F.N. and Dipartimento di Scienze Fisiche
Universita di Napoli Federico II
Pad 19 Mostra D'Oltremare
80125 Napoli- Italia
Tel: +39817253424, Email: diliberto@na.infn.it
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Fu-Kwun Hwang
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« Reply #2 on: March 05, 2007, 02:52:26 PM »
It is the PV-diagram. So the vertical axis is P, and horizontal axis is V.
Right click the mouse button in the simulation region will toggle simulation on/off.
Temperature is shown as PV/(nR).
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bazu
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« Reply #3 on: March 20, 2007, 09:52:56 PM »
i am unable to see ur model of any topic plz tell me how i can hv a view of it.
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Fu-Kwun Hwang
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« Reply #4 on: March 21, 2007, 08:59:33 PM »
This applet was created many years ago with JDK1.0.2. You need to see the source code to find out the model.
Actually, it is a standard model in any physics text book. We can discuss it if you want.

For those applets created with EJS, you can click load ejs as signed applet to see the model.
(You will be asked to grant the permission to load EJS into your computer, then the program will be run in a browser and you will see all the variables and equations used in the simulation in a GUI)
Please check out applets from another category: Easy Java Simulations (2001- )
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Fu-Kwun Hwang
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« Reply #5 on: November 05, 2007, 09:30:06 AM »
Related flash animations found on the web

Carnot Cycle
http://www.cs.sbcc.net/%7Ephysics/flash/heatengines/Carnot%20cycle.html


The 2 Stroke Engine
http://www.cs.sbcc.net/%7Ephysics/flash/heatengines/2stroke.html


The 4 Stroke Engine
http://www.cs.sbcc.net/%7Ephysics/flash/heatengines/4stroke.html


The Stirling Engine
http://www.cs.sbcc.net/%7Ephysics/flash/heatengines/stirling.html
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baloch.2008
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« Reply #6 on: October 27, 2008, 03:09:57 PM »
how i can download this carnot cycle pic
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lookang
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« Reply #7 on: October 28, 2008, 03:29:08 PM »
This is a flash animation, not a pic like u said.

 I am using Firefox so go download it and follow this simple method without those pay $$ for swf downloaders.

1. Saving Flash files from Firefox

Firefox for Newbies
a. Click Tools - Page Info
b. Click the Media Tab on the Page Info Windows
c. The media tab has a complete list (with preview) of Images, CSS Files and Shockwave Flash files that were downloaded by the Firefox browser while rendering (loading) the page.
d. Scroll down the list and locate the swf file.
e. Click the "Save As" button. Select some directory on your hard drive and save the file (No need for a third-party plug-in)

It is easy right?

Reference:
http://labnol.blogspot.com/2005/11/save-flash-from-firefox-and-ie.html
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